bitbake: track 'overlayed' recipes

Recipes that have been 'overlayed' (where there is a recipe in another
layer where that layer has a higher priority) are now listed within
cooker.overlayedlist for use in bitbake-layers. This is a dict with
keys of the topmost (highest priority) recipe file.

(Bitbake rev: 370fc603d79f9c34cc23b4b520b685256c23df5d)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/cooker.py

@@ -33,6 +33,7 @@ import threading
 from cStringIO import StringIO
 from contextlib import closing
 from functools import wraps
+from collections import defaultdict
 import bb, bb.exceptions
 from bb import utils, data, parse, event, cache, providers, taskdata, command, runqueue
 
@@ -1060,6 +1061,18 @@ class BBCooker:
                self.appendlist[base] = []
             self.appendlist[base].append(f)
 
+        # Find overlayed recipes
+        # bbfiles will be in priority order which makes this easy
+        bbfile_seen = dict()
+        self.overlayed = defaultdict(list)
+        for f in reversed(bbfiles):
+            base = os.path.basename(f)
+            if base not in bbfile_seen:
+                bbfile_seen[base] = f
+            else:
+                topfile = bbfile_seen[base]
+                self.overlayed[topfile].append(f)
+
         return (bbfiles, masked)
 
     def get_file_appends(self, fn):